Flying hot saw



March 24, 1953 I T. WILSON ET AL FLYING HOT SAW 11 Sheets-Sheet 1 Filed Nov. 12, 1947 H Tom 11 253010 lawrfi uz .IHess,

March 24, 1953 Filed Nov. 12, 1947 T. WILSON ETAL FLYING HOT SAW 11 Sheets-Sheet 2 March 24, 1953 T. WILSON ET AL 2,632,232

FLYING HOT SAW Filed Nov. 12, 1947 11 Sheets-Sheet s llll llllu invfaniars lawrmve J H665.

Altorney March 24, 1953 T. WILSON ET AL 2,632,232

' FLYING HOT SAW Filed Nov. 12, 1947 11 Sheets-Sheet 4 Inventor's" and Tom W tbs-01y Lawrence J 166.5,

T. WILSON ET AL FLYING HOT SAW March 24, 1953 Filed Nov. 12, 1947 11 Sheets-Sheet 5 lzu/enfors V 1 0170 it $280.11., lawrence Jflass. j fi/faa 32019216 March 24, 19 53 T. WILSON ET AL 2,632,232

FLYING HOT- SAW Filed Nov. 12, 1947 11 Sheets-Sheet 6 Menlbf and, Ibm Wzlsalv Lawrence J Hess.

T. W ILSON ET AL March 24, 1953 FLYING HOT SAW ll Sheets-Sheet 7 Filed Nov. 12, 1947 bu /6130115 Ibm Wils'om Q ES Laymgzulfless. llliojjzy March 24, 1953 Filed Nov. 12) 1947 'r. WILSON ETAL FLYING HOT SAW 11 Sheets-Sheet 8 Inv'eniors alweza'e J Hess.

Aii0r V March 24, 1953 1-. WILSON E AL 2,632,232

FLYING HOT SAW Filed Nov. 12, 1947 ll Sheets-Sheet 10 bwenlvrs T'am W 59010 Lawrence 11516619,

March 24, 1953 Filed Nov.

T. WILSON ETAL- 2,632,232

FLYING HOT SAW 12, 1947 ll Sheets-Sheet ll fler' llnierval.

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Inventors Tom Wzls'azr/ V 261306 J Hf??? Patented Mar. 24, 1953 tJNlTED srA'ras PATENT OFFICE FLYING HOT SAW Tom Wilson and Lawrence J. Hess, Baltimore, Md., assignors to Bethlehem Steel Company, a corporation of Pennsylvania Application November 12, 1947, Serial No. 785,372

12 Giaims. 1

This invention relates to apparatus for automatically severing rapidly moving objects such as pipes, rods and the like into predetermined lengths and is more especially designed for use with a continuous butt weld pipe mill. In pip-e mills of this type the skelp when it comes from the rolling mill is in large coils. These coils are fed rapidly in succession to a machine which uncoils the skelp and straightens it and then it is advanced in a ribbon like form on a run out table or floor of the mill to form a long loop or a series of loops. The skelp is then passed through a furnace where it is heated to a welding temperature. As it issues from the heating furnace it is drawn through a hell or forming rolls, then between Welding and sizing rolls, and while still hot and moving rapidly it is cut by a flying saw into commercial lengths. The cut lengths are then passed between descaling rolls and lastly transferred to a cooling bed. After a coil of skelp has been fed in this manner the next coil is placed in the machine for unco-iling. As this coil is fed to the run out table the crop ends of the rear end of the fed coil and the forward end of the coil to be fed are cut oil and the two ends welded together. These operations are repeated and the skelp and pipe formed therefrom are advanced continuously at high speed.

In one well known and often used type of flying saw, a guide or trough supports the moving pipe in a fixed position with reference to the saw carriage, while the motor and saw are tilted laterally thereof on a reciprocating saw carriage to cut the pipe.

This type of saw in operation, however, has several disadvantages. If the pipe is traveling at a speed of 500 feet or more a minute as is the case in forming the smaller sized pipe and is being cut into 20 foot lengths, the saw must make every cut in less than two and one half seconds. To trip the weight of the saw and motor at this high speed causes excessive wear on the carriage and to eliminate this condition the mill has to be slowed down, thus reducing the tonnage produced, or else an undue amount of valuable time and labor must be expected to be wasted in frequent shut downs for repairs.

One of the objects of our invention relates to the mechanism for automatically raising the pipe above the normal pass line into cutting engagement with the saw by means of a reciprocating swinging trough during a forward stroke of an oscillating saw carriage.

Another object of our invention relates to the mechanism for controlling the vertical movements of the reciprocating swinging trough.

Another object of our invention relates to the apparatus for holding the reciprocating swinging trough in a lower path which allows the pipe to follow the normal pass line during one or a plurality of reciprocations of the carriage.

Another object of our invention relates to generally to the apparatus for controlling the vertical movements of the reciprocating swinging trough for cutting into predetermined lengths continuously moving pipe during one or a plurality of oscillations of the carriage and means for synchronizing the movement of a pipe severing device with the moving pipe.

Another object of our invention relates to the manner of supporting the saw carriage for swinging movement.

Another object of our invention relates to the mechanism for driving the saw.

Another object of our invention relates to the carriage and cutting apparatus of this type with means which can be preset to indicate the travel of the pip-e in feet and inches per minute.

Another object of our invention relates to a carriage and cutting apparatus of this type with mechanism which can be preset to cut automatically a plurality of pipe sections of uniform lengths.

Another object of our invention relates to a carriage and cutting apparatus of this type with mechanism by means of which pipe sections of different lengths can be automatically cut.

Another object of our invention relates to the means for adjusting the stroke of the saw carriage.

Another object of our invention relates to a carriage and cutting apparatus of this type having a lost motion device between the rocking lever and the motor for adjusting its stroke.

With the foregoing and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the appended claims.

Referring now to the accompanying eleven sheets of drawings which form a part of this specification and on which like characters of reference indicate like parts.

Figure 1 is a front elevation of a pipe severing device embodying our invention with parts shown in section.

Fig. 2 is a detail section of the cone-drive gearing for the rotating saw taken on the line 2--2 of Fig. 3.

Fig. 3 is a detail section taken on the line 3-3 of Fig. 2.

Fig. 4 is a transverse section taken substantially on the line 44 of Fig. 1.

Fig. 5 is a detail side elevation of the solenoid, latch lever and bell crank for controlling the cam members.

Fig. 6 is a detail section taken on the line 65 of Figure 4.

Fig. '7 is a detail of the I'OOkll'lg lever and connections with parts in section.

Fig. 8 is a detail view of the constant drag brake taken on the line 88 of Fig. "1.

Fig. 9 is a detail view showing the jaws of a lost motion device taken on the line 9-9 of Fig. 7.

Fig. 10 is a detail of the carriage drive mechanism with parts in section taken substantially on the line Ill-Iii of Fig. l to show more clearly the construction.

Fig. 11 is a detail in top plan showing the mill motor and the last sets of sizing rolls for advancing the pipe past the saw carriage.

Fig. 12 is a detail section of the controlling apparatus for the cams taken on the line l2l2 of Fig. 1.

Fig. 13 is a detail view in section also taken on the line l9l9 of Fig. 1 showing the connection between the cut timing gears and the connecting rod which extends and is pivoted to the rocking lever.

Fig. 14 is a detail of the planetary gears for controlling the saw cuts.

Fig. 15 is a diagram of the electrical control circuits for producing a uniform action saw carriage drive.

Fig. 16 is a detail view of a device which indicates the travel of the pipe in feet per minute.

Fig. 17 is a diagram illustrating an arrangement to preset the length of pipe to be cut.

Fig. 18 is a front elevation of the dial indicator device.

Fig. 19 is a vertical longitudinal section of the dial indicator device taken on the line l9l 9 of Fig. 18.

Fig. 20 is a detail transverse section showing the driving gears for the dial indicator taken on the line 253-40 of Fig. 19.

Fig. 21 is a diagram of the electrical control circuits for the sequence operation which will determine the number of oscillations of the saw carriageper cut of pipe section.

Fig. 22 is a diagram showing the circular path of the stub shaft for the planetary moving pinion and the horizontal movement per 5 intervals of the crank or eccentrically disposed portion.

Fig. 23 is a diagram showing the relative horizontal speeds of the crank or eccentrically disposed portion of the stub shaft during the reciprocation of the saw carriage.

Referring now to the various characters of reference on the drawings, the numeral I indito a shaft 1 journaled in a gear casing B which extends beyond the same at its opposite end and is connected by a train of gearing 9 to a synchro-tie generator i5] and tachometer H. The shaft I journaled in the gear casing 8 is provided with a worm l2 meshing with a worm wheel [3 which is keyed to a rotatingtubular shaft Hi journaled in roller bearings l5 and It in the gear casing 8. A fixed shaft ll extends through the tubular shaft Hi and is keyed at one end as at It to the cap is for the roller bearing i5 and supported near its opposite end in a roller bearing 28 and extends beyond the same and has a gear 2! keyed thereto meshing with a pinion 22 mounted for planetary movement around the gear 2| on a stub shaft 23 journaled in roller bearings 24 and 25 of the casing for gear 2!, and the pinion 22, which has its inner cup shaped portion 25, formed integral with the tubular shaft i l and an outer cover portion 2'! attached thereto.

The stub shaft 23 has an outwardly crank portion 28 which is eccentrically disposed in relation to the main body of the stub shaft and is provided with a roller bearing 29 thereon for pivoting one end of a pitman rod 39 which extends to the rocking lever B! and is pivotally connected to the adjustable block 32. The rocking lever 3| has spaced side frame members 33 and 34 which are pivotally connected at their lower ends as at 35 to one end of the saw carriage 353. The side frame members 33 and 3 3 are connected at intermediate points by means of cross-tie web plates 31 and 33 and at the upper end by means of a housing as which is connected to the cross web plate 38 centrally by means of a tubular casing M. The web plates 3? and 38 and the upper end of the tubular casing 49 are provided with bearings 4|, $2 and 43 in which is journaled a spindle it having a beveled gear as secured to its upper end and at its lower portion threaded as at 5 for engaging the adjustable block 32. The housing 39 at the upper end of the rocking lever 31 is provided with trunnion projections and 43 journaled in bearings 49 and 50 mounted in the frame 5| of the machine. Journaled in the housing 39 at the upper end of the rocking lever 3| is a shaft 52 having a beveled pinion 53 secured thereto for meshing with. the beveled gear on the upper end of the spindle (id. The shaft 52 extends through the central portions of the trunnion {l8 and has a brake disk 54 for a band brake 55 which is connected to bearing by means of a pin 56 and is adapted to produce a constant drag on the brake disk 54. The brake disk 5A is also provided with a pair of jaws 5'! for engaging a similar pair of jaws 58 extending from a brake disk 59 for a friction brake secured to a shaft of the motor 1. The jaws 5'1 and 58 are spaced far enough apart to allow the rocking lever 35 to swing its maximum stroke and form a lost motion device during the normal oscillation of the saw carriage 36.

When it is desired to adjust the stroke of the carriage 35 the motor 4 will rotate the brake disks 54 and 59 and shaft 52 thereby rotating beveled pinion 53, beveled gear 55 and spindle Ml to raise or lower the adjusting block 32 de-. pending upon which way the shaft 6!] of the motor 5 is rotating.

The adjustable block 32 has trunnions 6| extending from its opposite sides. The trunnions 5| are pivoted in journal bearings in the bifurcated end of pitman rod. 3!! which has its other end pivoted on the roller bearing 29 on the crank portion 28 of the stub shaft 23.

The carriage 36 comprises a. frame 62 formed tubular at one end as at $3 in which is journaled a shaft 64 having a saw 65 secured to the outer end. The shaft 64 is driven by a cone-drive having the Worm wheel 66mounted on the inner end of a shaft 68 meshing with a worth 67 which is mounted on the shaft 64 journaled in the carriage frame 62 and the shaft 68 is also provided with a pulley 69 for a texrope drive having a multiple belt connection to the pulley ll} of the motor shaft II of a motor 72. The motor I2 is mounted on the horizontal portion of an L-shaped support 33 and is adapted to have limited movement by having the vertical portion l i extending upwardly and pivoted at an intermediate point to a bracket 75 which extends from the side of the frame 5i of the machine and having an eye bolt it pivoted to the upper end of the vertical portion 74 which extends through the side wall of the frame SI and provided with a spring ll held in position by means of a nut 18.

The saw carriage 35 at each end has a link connection to the frame 5I to allow for swinging movement. The rocking lev-er 3! is adapted to serve as one link for supporting one end of the carriage while the other end of the carriage has a .link I9 the lower end of which is pivoted thereto as at 8B and the upper end is pivoted to the frame 5! as at 8 I.

Extending downwardly from the end of the saw carriage 36 below the rocking lever 3| is an arm 82 to the lower end of which is pivoted as at 83 one end of a pair of connecting rods M. The other ends of the rods are pivoted as at 85 to the movable trough 5 and the upper end of the vertical link 86.

In order to actuate the limit switch that controls circuits for the sequence operation, which will determine the number of oscillations of the saw carriage per cut, the fixed shaft I1 is also formed tubular for receiving a shaft 87 which extends through the fixed shaft I! with its end extending beyond the same. The outer end of said shaft 8! is formed with a head 88 which is secured to the cover 2'! while the other end of the shaft Bl extends beyond the fixed shaft H and is coupled as at 89 to the shaft 90 of a limit switch 9!.

In operation the saw carriage 36 and saw 65 are adapted to oscillate continuously with the saw motor ":12 in a substantially fixed position in relation thereto while the trough 6 is adapted to raise the pipe I into cutting engagement with the saw 65 for one or after a plurality of oscillations of the carriage.

The operation of tilting the trough 6 with the pipe I into cutting engagement with the saw 65 will be more clearly understood by referring to Figs. 1, 4, 5, 6 and 12 of the drawings. A beveled gear 92 is keyed to the intermediate portion of the tubular shaft It which meshes with a similar beveled gear 93 secured to a shaft 94 mounted in a bearing 95 in the gear casing 8. The shaft 9 3 extends outwardly and downwardly beyond the side wall of the gear casing and is coupled to a spindle 9% which has its lower end coupled to a shaft Ill having a beveled gear 98 secured to its lower end meshing with a similar gear 99 mounted on the outer end of a cam shaft I09 which is journaled in bearings IIlI and H12 in a housing N33.

The cam shaft IQB has a cam member I06 mounted thereon at an intermediate point which is splined thereto as at IE5 to allow for longitudinal movement. The cam member IIM has a collar I66 provided with an annular groove It? to receive the trunnion projections I08 of a forked lever Hi9 which is mounted on a shaft I I I having at one end a bell crank lever III having a pawl II2 for engaging a latch lever II3 which is pivoted to a standard I I4 as at H5 and actuated to unlock the latch by means of a solenoid IIB. The cam member I04 has a main cam II! for engaging a cam roller I I8 mounted on a shaft H9 journaled in the lower end of the vertical movable link 36 and is further provided at its ends with bell crank arms I20 for engaging fixed stops IZI.

The cam member I04 is also provided with a secondary cam I22 for engaging a cam roller I23 which is mounted on an extension I24 of the bearing IBI and adapted to slide the cam member to disengage the main cam II'I out of engagement with the cam roller I I8.

The solenoid IIB when energized is adapted to actuate the latch lever II3 to release the latch and resilient means to return the latch to latching position comprising an eye bolt I25 pivoted as at I26 to the latch lever and extending downwardly therefrom through one leg of an L shaped bracket I21 having a washer I28 and nuts I29 on its lower end with a springISEI interposed between the washer I28 and the leg of the L-shaped bracket I21.

The bell crank lever I II on the end of shaft IIIi has a horizontally extending arm to which is pivoted as at I3I a clevis bolt I32 the shank of which extends upwardly with the upper end extending through a bracket I33 which is secured to the housing I63, and a spring I34 is interposed between the clevised head of I32 and the bracket. This spring normally holds the bell crank lever III in a position to the forked lever I09 to move the cam member I64 so that the main cam II! and secondary cam I22 will be out of engagement with the cam rollers I I8 and I23.

The bell crank arms 'IZEI are pivoted to the ends of the shaft H9 and extend laterally therefrom and have their outer ends connected to a shaft I35 provided with a vertically extending arm I36 having its lower end pivoted to a clevis bolt IS? the shank of which extends through the side wall of the housing I 03 and has a washer I38 and nut I39 on its outer end with a spring I46 interposed between the washer I38 and the side wall of the housing I03.

As shown in Fig. 1 the saw carriage 36 is in a forward stroke with the pipe I raised above the normal pass line to the cutting position by the vertically movable trough I5. The vertical movements of this trough are controlled by the main cam II? and on all return strokes of the carriage the vertically movable link 86 carrying the trough is held down against the fixed stops I25 by gravity and the pressure of the spring Hit thereby holding the trough to a lower path which allows the pipe I to follow the normal pass line below the path of the saw I55. Also on the return stroke the main cam Ill is disengaged from the cam roller lit by the secondary cam I22 and is normally held in the disengaged position by the latch lever H3 engaging the bell crank lever Iii mounted on one end of the shaft Iii carrying the forked lever E59.

, The solenoid H6 when energized after one or a plurality of oscillations of the saw carriage actuates the latch lever H3 thereby releasing the bell crank lever III and allows the saw to cut the pipe I on the next forward stroke of the carriage 3G. The cams and latch mecha nisms and adjacent parts will then be in the position indicated in full lines in Figs. 1, 4, 5 and 12. In Figs. 18 and 19 we have shown means for indicating the length of pipe cut in which MI is a dial mounted on a pedestal support I42 I12 it closes relays I13, I1 1, I15 and I16.

having indicating scales graduated in feet as at I43 and inches as at I44 and provided with pointer hands I45 and IE6 therefor respectively. The shorter hand I45 pointing to feet is secured to the outer end of a tubular horizontally extending shaft I11 supported in a journal hearing IE8 extending from the top portion of the pedestal support I42 and has a beveled gear H19 mounted on its opposite end which meshes with a beveled miter gear I58 which is secured to a vertically extending shaft I51 near the top portion. The longer pointer hand Ifi' is secured to the outer end of a small shaft I52 mounted in the tubular shaft I41 and has a beveled miter gear I 5-3 secured to its opposite end meshing with a beveled gear I54 attached to the upper end of the shaft I5I. The vertically extending shaft I5! is journaled in the pedestal support I42 and is coupled at its lower end as at I55 to a stub-- shaft I56 journale'd in a housing 151 and having "a worm wheel I58 mounted thereon meshing with a worm 159 supported in the housing I51 and having a shaft I60 extending outwardly therefrom upon which are mounted sprocket Wheels I81 and IE2. The sprocket wheel ISI is connected by means of a sprocket chain I63 to a sprocket wheel IBd on the shaft of motor 4 which'extends to a synchro-tie generator I65, and the sprocket wheel IE2 is connected by means of a sprocket chain H55 to a sprocket wheel I61, on the shaft for a limit switch I68.

The speed or the driving means is controlled to suit the speed of the pipe I, through synchrotie generators and motors as the speed and stroke of the saw carriage 36 will vary with the adjustment of the pivotal end of the pitman rod 38 on the rocking lever "3| it is necessary to compensate for the variation during the cutting operation by having the opposite end of the pitman rod 38 pivoted on the eccentrically disposed portion '28 of the stub-shaft 23. As indicated in Figs. 13 and 14 the pinion '22 on the stub-shaft 23 revolves in a circular path around the fixed gear 2| in a planetary manner with the crank or eccentrica'lly disposed portion of said stubshaft traveling in an eccentric path as indicated in the diagram in Fig. '22. 'This will give a relative horizontal uniform speed to the saw carriage 36 'and's'a'w 65 during the cutting operation as indicated in the central'portion of the diagram shown in Fig. 23.

The pinion 22 revolves once around the fixed gear 21 for each oscillation of the saw carriage 36, while at the same time the shaft 81 secured to the cover 21 and shaft 93 of limit switch 9| rotate the control segments I59, I10 and HI of the limit switch 9| one revolution for each oscillation of the saw carriage and the control for the sequence operation which will determine the number of revolutions of the pinion 22 per cut is indicated in Fig. 2-1. This diagram shows an arrangement that will accommodate any spacing from one revolution to seven revolutions of the pinion 22 and control segments per cut, and assuming that the contact arm for the cut selector is set on No. 3 position and the coils for the relays are deenergized and in the position as indicated in the diagram, when control segment I69 malres contact with the fingers A holding circuit is established through coils I11 and I18, but current does not flow through the same until control segment I68 breaks contact, at which times coils I11 and I18 are energized, opening contacts I19 and I80 and closing I8I.

ment

When control segment I69 makes contact with the contact fingers I12 on the second revolution, relays I82, I83, and 1% are closed and a holding circuit established through coils I85 and I86, but current does not flow until control segment 1B9 breaks contact at which time coils 485 and I85 are energized thereby opening contacts I81 and I88 and closing contact 189. Coils 511 and I18 are deenergized, closing contacts I19 and I and opening contacts I31, I13, I14, I15 and I15. The functioning of segments I18 and HI has no effect on this sequence.

When control segment I59 makes contact with the contact fingers I12 for the third revolution, relays Ito, E91 and It? are closed thereby immediately closing relays- I93 and I94 for controlling the solenoid H6 and opening relays use and I95. Relays 18-3 and 19 remain closed due to the interlocking action of the control segment I'lt which engages the contact fingers I91 of the holding circuit. This closes 1-93 and I95 and opens relays E83, I38, 196, 191 and I92, thus resetting the control relays. Control segment I19 then breaks contact to open relays I93 and 19:1 and closes relays I95 and I96 after the cut is made.

Assuming that the cut selector has been set for No. 6 when control segment I89 makes contact with the fingers 112 on the third revolution relays 5911, E91 and 192 are closed and thi establishes its holding circuit through coils 1% and 1%. When contact segment I59 breaks contact 2 89 closes and 2111 and 262 are opened, and the holding circuit for I82, I53, I81, 185 and I86 is opened.

On the fourth revolution when control segment H39 makes contact with the fingers it closed relays 2%, 2M and 255. One side of the circuit is made through contacts 2%, I91 and through 293, 2% and 2115 coils to bus bar line, and the holding circuit from the bus bar line through relay contacts I98 and I88, coils I11 and I18, contactors 2113, coils 2M, 2M and 2% to the bus bar line. When coils I11 and I13 are energized contact 2% is opened through the interruption of the holding circuit for I98, HI and I92.

On the fifth revolution when the control seg- 159 makes contact with the fingers, it

closes relays 2%, 2111 and 263. One side of the circuit is made through contacts 219i, I-ti, Illi,

26-1, coils 291 and 2518 to bus bar line, and the holding circuit through contacts Hit, 292, coils 185, Ifi e, contact 2% and coils 2% 231 and 288 to bus bar line. When the coils I and IilE are energized contacts I81 and I88 are opened and contact is closed and interrupts the holding circuit for 20 1 and 2215.

On the sixth revolution when the contact segment I68 makes contact with the fingers it closes relays 2&9, 21d and 2H and immediately closes relays 15a and I94 which control the saw solenoid and opens contacts of I and I95 relays.

Relays 191 and I93 remain closed through the interlocking action of the holding circuit and contact segment 51%. The opening of relays I95 and 5% opens relays 2%, 2131, 233, 21B and 2H, thus resetting the control relays and when contact segment i111 breaks contact it opens relays H3 and IE and allows I95 and I98 to close. After the cut is made all the relays will be deenergized and will be in the position indicated in Fig. 21, and the desired sequence can be repeated.

If a test piece is desired, the push button M2 is pressed and relays 2l3 and 2M will be closed and stay closed through the action of the holding circuit as established by relay 2l3. If this occurs during the first revolution of a sequence when relays W3, il l, H5 and H6 are closed, relays i933 and use will be closed by a circuit established from the bus bar line through contacts H3, H6, I75, coils We, I93, I96 and H5 to the bus bar line. This will actuate the saw out solenoid H6 as described previously.

At the same time that this is occurring the interlocking and disconnecting circuit for the test piece circuit i functioning. After the closing of 2E3 and the resulting closing and interlocking of 253 and 2M and when contact seg ment Hi9 engages the contact fingers H2 a circuit will be established from the bus bar line through segment Hi9, contacts 26!, E81, H9, 2l3, coils of l5 and El 6, and contact 2 l3 to bus bar line. This will open 21% and close 2l5. At the same instant use closes the contact segment ill will engage the fingers 211 and close a circuit shorting contact 2H5. As a resultthe holding circuit of 2E3 and 216 will be maintained until switch ll! is opened. At the same time coil 2E5 establishes a holding circuit for itself and 2&6 through its own contact.

When contacts I93 and I92 are closed contacts i535 and 595 will be opened deenergizing coils 15 and H6. However, contacts I95, I93, I93, and i9 1 will be interlocked by contact segment ill] until after contact segment 569 is opened and the test piece cut. When contact segments i'lt and iii are opened contacts I93 and i9 3 will open and the short around Zlfi will be withdrawn, allowing 215 to break the interlocking circuit 253 and 2M. When 2l3 opens the interlocking circuit of 2 l5 and 2N5 will be broken and 2 it will open, thus restoring the test piece circuit to normal.

In case push button 2 i2 is closed after the first revolution, the sequence will continue to completion, and on the next revolution when contact segment its engages the contact fingers 512, a test piece will be cut as previously described.

Relays 2E8 and 2l9 are also provided for a seventh revolution per cut.

With this manner of control after the saw has made its out all the coils for the relays will be deenergized and the desired sequence can then be repeated.

Refer ing now to Fig. which is a view showing dia rammatically the electrical circuits for controlling the operation of the drive for flying saw, the positive and negative bus bars are indi- 'cated by the numerals 229 and EH respectively, 3 the mill motor, G the motor for adjusting the stroke of the swinging lever, and 5 the motor for oscillating the saw carria e each of which is provided with a circuit 222, 223 and 22%, respectively, extending to the bus bars 228 and 22L The mill motor 3 is connected by means of gearing 22% or the like to a synchro-tie generator 225; which is adapted to drive through the circuit connection 22? a synchro-tie motor 223 which has. a shaft for actuating a mechanical diiferential 229 provided with a regulator to adjust speed of the driving motor =5 and a pulley 23. which is connected by means of belt to the cone pulley 233, having a shaft rotated by means of a synchr-o-tic motor 235 having a circuit connection 23% extending to the compensate for various saw radii the belt 232 connecting the cone pulleys 23,! and 233 is provided with a threaded belt shift 23! which is adjusted by means of a threaded rod 238 adapted to be rotated by means of a synchro-tie motor 239, having a circuit 24! extending to a synchrotie motor 2 These two synchro-tie motors 239 and 25! receive their power from the synchrotie generator H65 driven by the motor 4 for adjusting the stroke of the rocking lever 3|, through the circuit 242.

In order to provide for Vernier adjustment of the pulleys 23! and 233 and the saw stroke, the synchro-tie 25 4 has a shaft 243 connected by means of a train of gearing ass with the shaft of the motor 265 having a circuit connection 246 extending to the bus bars 228 and 22L Said motor 245 is also provided with a brake 2A? for controlling the same.

The motor 5 for oscillating the saw carriage has its shaft provided at one end with a D. C. magneto generator 258 having a circuit connection 2% extending to a voltmeter 259 calibrated for indicating the gear motor speed.

The opposite end of the shaft for the driving motor {a is connected to reduction gearing in the gear casing 5 as shown in Fig. 10 of the drawings. The shaft of motor 5 is also connected by a train of gearing 9 to a synchro-tie generator 19 and a tachometer H which may be used in addition to the meter 25!! for indicating the speed of the driving motor 5 at this point.

Mounted on a support adjacent to one end of the gear casing 8 is the limit switch 9! having the control segments E69, Elli and HI and con tact fingers H2, l9! and 2H mounted therein for the saw out control circuits.

The motor 4 for adjusting the stroke of the rocking lever 3i and. synchro-tie generator 565 have their shafts coupled together with a sprocket wheel i6 3 mounted-on the shaft of the motor 4 connected by means of a sprocket chain m3 to a sprocket wheel Hi! on the shaft H60 for the worm i553 for actuating the hands on the dial Ml to indicate the length of pipe being cut. The worm shaft ltll is also provided with a sprocket wheel 162 which is connected by means of a sprocket chain N36 to a sprocket wheel lfil for actuating a limit switch I68 for controlling a dial indicator, the operation of which will be clearly understood by referring to the diagram shown in Fig. 17. In this diagram illustrated in Fig. 17 there is shown the indicating dial 25! with an arrangement to preset the length of pipe to be cut. This dial has a scale 252 which'reads in inches corresponding to the length of the travel of the pivotal point upon the rocking lever 31 which controls the stroke of the saw carriage.

out, by means of an adjusting knob 2553. With this device the operator while rolling a schedule of pipe of a given length will determine the next length of pipe to be cut and will move the contact arm 25% to a value on the scale 252 that will correspond to the are through which the rocking lever arm will travel. To illustrate this,

assume that the operator by means of the adjusting knob 266 moves the contact arm 258 to the right, which would permit cutting. a longer length of pipe than is being cut at the time this change is being made. Nothing will happen until the double throw switch 26I which is marked manual at the top and automatic at the bottom is thrown to the bottom. When this is done the left-hand blade of the switch 26I shown in Fig. 17 will be active and will close the circuit to the operating' coils 252 and 263 marked long in the diagram. The circuit will be from the left-hand bus bar through coils 262 and 253 marked long and then back to the revolving segment 264, contact 258, middle stud of knob 260 of dial 25I and then back to the opposite side of the control bus bar. This will start motor 4 in the direction to increase the length or radius of the rocking lever arm and by means of the synchro-tie equipment the dial 25I- will rotate until its automatic position corresponds to the preset position of the contact arm 258 at which time the motor 4 will stop.

If the operator desires to cut a shorter length of pipe he moves the contact arm 258 to the left which will permit cutting a shorter length of pipe than is being cut at the time this change is being made. When the switch 26I is thrown into' the automatic position, the right-hand blade of said switch will be active and will close the circuit to the operating coils 265 and 2 66 marked short. The circuit will then be from the left-hand bus bar through coils 265 and 266 marked short and then back to the revolving segment 261, contact arm 258, middle stud or knob 260 of dial 25I, and then back to the righthand bus bar. This will start motor 4 in the reverse direction to that above described and will decrease the length or radius of the rocking lever and by means of the synchro-tie equipment, the dial 25I will rotate until its off position corresponds to the preset position of the contact arm 258 at which time the motor 4 will stop.

If for any reason it is desirable to inch the motor 4 to change the radii of the rocking lever arm, the switch 26 I can be moved to the upper position marked manual after which the motor 4 can be moved in one direction or the other depending upon which way the vertical handle 268 of the master switch 269 is moved. It will be noted that on the left-hand side the master switch 269 is marked long and on the righthand side short. The switch 26I is a standard double-pole type of control switch and is adapted for the operator to hold it in position until the desired movement is completed and then return it to the 011 position.

If there is any over-travel the said two-pole switch 26! will cause the motor 4 to start in the reverse direction to come back to position.

In Fig. 16 is shown a device that will indicate the travel of the pipe in feet per minute, and a corresponding instrument that will be calibrated on a similar scale that is operated by a magneto generator on the motor 4 that rotates the rocking lever arm. This consists of a pinch roll 270 which contacts with the traveling pipe I which drives a D. C. magneto generator 27! to which is connected 2. voltmeter 212 callbrated in feet per minute. A similar instrument 250 is connected to the magneto generator 248 driven by the motor 5.

Having thus given the foregoing general and detailed description of our invention, we will now further describe the operation of the same.

Assuming that the cut selector is set on No. 3 position as. indicated in Fig. 21, the pipe I, after leaving the welding and sizing rolls 2, is advanced through the channel or stationary trough 213 into the movable trough 6 adjacent to the continuously oscillating saw carriage 36 having a continuously rotating saw 65 mounted thereon. The upper ends of the rocking lever SI and the link 19 are pivotally supported on the stationary frame 5i of the machine, while the lower ends of said rockingv lever 3| and the link 79 are pivoted to the saw carriage 36 which is adapted for longitudinal swinging, movement.

The saw carriage 36 is oscillated by means of a motor 5 through shaft 1, worm I2 and worm. wheel I3 which is keyed to a rotating tubular shaft I4 journaled in bearings in the gear casing 8. The tubular shaft I4 has an enlarged extending cup shaped portion. 26 with a cover 27 in which is journaled. the stub shaft 23 having a pinion 22 mounted thereon adapted to revolve in a concentric planetary path around a fixed gear 2I. The stub shaft 23 has a. crank arm 26 eccentrically disposed extending portion for pivoting one end of the pitman rod. 36 having its opposite end pivoted to the adjustable block 32 mounted on the threaded portion 46 of the spindle 44 which is journaled in the rocking lever SI, and rotated by the motor 4.

Keyed to the tubular shaft I4 in the gear casing 8 is a beveled gear 92, meshing with a beveled gear 93 on shaft 94. which is connected by a spindle 96 that is coupledto a shaft 61 provided with a beveled gear 96 meshing with a similar beveled gear 39 on the. cam shaft I66 journals-d in bearings I III and I62 and rotatable therein. A cam member I64 is splined to the cam shaft I00 for longitudinal movement having a main cam II! for engaging cam roller II 8 and a secondary cam I22 for engaging cam roller H3. Normally the cam member I64 is in the posi tion indicated in dotted lines in Figs. 4 and 12 with the cam roller H8 disengaged from the main cam II I and the vertically movable link 86 and trough 6 in the lowered position with the ends of the horizontally extending arms of the bell crank levers I26 secured to the shaft H9 held against the fixed stops I2: by the action of spring I46. In this position the latch II 3, and bell crank lever III on the end of shaft III) will be in the latched position as shown in dotted lines in Fig. 5, with the forked lever I09 in the position shown in Fig. 4 and held in these positions by means of the springs I36 and I34 the solenoid II6 being deenergized. The shaft 87 in shaft I1 has its head 88 secured to the outer cover 21 of the cup shaped portion 26 and rotates therewith during each oscillation of the saw carriage 36. The inner end of shaft 81 is coupled as at 89 to the shaft 90 of the limit switch 9| having the contact segments I69, I76 and Ill and the contact fingers I72, i6? and ZI'i adapted to engage the same mounted therein.

As the cut selector is set on No. 3 during the first two oscillations of the saw carriage 36 the parts will remain in the position indicated in dotted lines in Figs. 4, 5 and 12. On the third oscillation of the saw carriage 36 the limit switch 9! will close the circuit to energize the solenoid II6 thereby disengaging the latch lever H3 from the pawl II2 of the bell crank lever III and allowing the springs I36 and I34 to move the parts into position shown in full lines in Figs. 1, 4, 5 and 12. This will bring the main cam II'I into the path of the cam roller II8 and raise the vertically movable link 86 and trough 6 with the pipe I into cutting position as the carriage oscillates in the forward stroke. After the pipe I has been cut and the solenoid H6 is deenergized, the secondary cam I22 engaging the cam roller I23 will again return the parts to the dotted line position above described, and will be held in this position by the springs until the solenoid H6 is again energized to repeat the operation.

Although we have shown and described our invention in considerable detail, we do not wish to be limited to the exact construction shown and described, but may use such substitutions, modifications or equivalents thereof, as are embraced within the scope of our invention, or as pointed out in the claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent is:

l. A machine for severing continuously moving pipe or the like into lengths successively, comprising a stationary frame, a carriage having a link pivoted at its lower end to the carriage and its upper end to the stationary frame for supporting one end of the carriage, a rocking lever having its lower end pivoted directly to the carriage and its upper end to the stationary frame for supporting the other end of the carriage, a motor mounted adjacent thereto for oscillating the carriage, gearing driven by the motor, a screwthreaded rod journaled in the rocking lever, an adjusting block screw-threaded to engage the threaded rod, a pitman rod connecting the driven gearing directly with the adjusting block, means for rotating the threaded rod to raise or lower the adjusting block to vary the oscillating stroke of the carriage, a saw mounted on the carriage, a motor resiliently supported on the stationary frame above the carriage for continuously rotating the saw, a driving connection between the motor and the saw, a vertically movable reciprocating trough mounted for longitudinal swinging movement adjacent to the saw for normally supporting the pipe in the pass line out of cutting engagement with the saw during the oscillation of the carriage, means for actuating the trough to project the pipe laterally into cutting engagement with the saw during an oscillation of the carriage, and means for returning the trough to its normal position after the cutting operation.

2. A machine for severing continuously moving pipe or the like into lengths, comprising a stationary frame, a carriage having a pivoted link connection each end with the stationary frame, means for oscillating the carriage, means for adjusting the stroke of the oscillating carriage, a continuously rotating saw mounted on the carriage, a motor mounted on the stationary frame for rotating the saw, a trough pivotaily connected by means of a rod to the carriage and adapted to oscillate therewith adjacent to the saw for normally supporting the pipe out of cutting engagement therewith, a driving connection between the motor mounted on the stationary frame and the saw, a vertically disposed link pivoted at its upper end to the trough and provided with a cam roller at its lower end, a continuously rotating cam for engaging the cam roller, a latch for normally holding the continuously rotating cam out of the path of the cam roller during the oscillations of the carriage, electromagnetically con-- trolled means for releasing the latch, resilient means for moving the continuously rotating cam into the path of the cam roller to raise the trough vertically to project the pipe into cutting engagement with the saw during an oscillation of the carriage, cam actuated means for returning the cam to its normal position, and stops for limiting the downward movement of the trough.

3. A machine for severing continuously moving pipe or the like into lengths, comprising a stationary frame, a carriage mounted for longitudinal swinging movement from the stationary frame, a rotating saw mounted on the carriage, a motor resiliently mounted above the saw carriage on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, means for continuously oscillating the carriage, a vertically movable reciprocating trough pivotally connected to the carriage for normally retaining the saw out of cutting engagement with the pipe during the oscillation of the carriage, and electrically controlled means for actuating the trough to project the pipe laterally to cut the pipe into predetermined lengths during an oscillation of he carriage.

4. A machine for severing continuously moving pipe or the like into predetermined lengths, comprising a stationary frame, a carriage having a pivoted link connection at one end with the stationary frame, a rocking lever pivotally connecting the other end of the carriage with the stationary frame, a motor mounted adjacent thereto for oscillating the carriage, gearing driven by the motor, 'a screw-threaded rod jo urnaled in the rocking lever, an adjusting block screwthreaded to engage the threaded rod, a pitman rod connecting the driven gearing with the adjusting block, means for rotating the threaded rod to raise or lower the adjusting block to vary the oscillating stroke of the carriage, a saw mounted on the carriage, a motor supported on the stationary frame for continuously rotating the saw, a driving connection between the motor mounted on the stationary frame and the saw, a movable trough pivotally connected to the carriage and oscillating therewith for supporting the pipe adjacent to the saw in the normal pass line out of engagement with the saw during the oscillation of the carriage, a vertically movable link mounted adjacent to the carriage having its upper end pivoted to the movable trough, a cam roller mounted in the lower end of the vertically movable link, a continuously rotating cam mount ed adjacent to the cam roller, means for normally holding the continuously rotating cam out of engagement with the cam roller during the oscillation of the carriage, automatic means for mov ing the continuously rotating cam into alignment with the path of the cam roller during an oscillation of the carriage to raise the trough above the normal pass line to project the pipe into cutting engagement with the saw, and means for retracting the continuously rotating cam from the path of the cam roller after the cutting operaion to return the movable trough to the normal pass line.

5. A machine for severing continuously moving pipe or the like into predetermined lengths, comprising a stationary frame, a carriage having a pivoted link connection at each end with the stationary frame, a rotating saw mounted on the carriage, a motor mounted on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, a motor having a connection with driving gearing for continuously oscillating the carriage, 'a trough pivotally connected to the carriage and adapted to oscillate therewith for supporting the pipe adjacent to the saw, a vertically movable V link mounted below and adjacent to the carriage having its upper end pivoted to the movable trough, a cam roller mounted in the lower end of the vertically movable link, a cam shaft adapted to be continuously rotated by a connection with the driving gearing, a continuously rotating cam member mounted on and splined to the cam shaft having a grooved collar and a vertically extending main cam for engaging the cam roller during the pipe cutting operation, a laterally extending secondary cam extending from the cam member, a shaft mounted beneath the cam shaft and extending at right angles thereto, a forked lever secured to said shaft having trunnion projections extending into the roove in the collar of the cam member for moving the main cam into or out of engagement with the cam roller, a bell crank secured to the said shaft having one arm formed with a pawl, a latch for engaging the pawl for holding the main cam out of engagement with the cam roller with the trough in its lower position with the pipe out of engagement with the saw during the oscillations of the carriage, resilient means for holding the pawl in its latched position, a solenoid adapted to be energized to release the latch from the pawl, resilient means connected to the other arm of the bell crank lever for moving the main cam into engagement with the cam roller to raise the trough and project the pipe into cutting engagement with the saw, and resilient means for returning the latch to the latched position with the main cam out of engagement with the cam roller.

6. A machine for severing continuously moving pipe or the like into predetermined lengths, comprising a stationary frame, a carriagehaving a pivoted link connection at each end with the stationary frame, a rotating saw mounted on the carriage, a motor mounted on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, a motor having a connection with driving gearing for continuously oscillating the carriage, a trough pivotally connected to the carriage adapted to oscillate therewith for supporting the pipe adjacent to the saw, a vertically movable link mounted below the carriage having its upper end pivoted to the movable trough, a cam roller mounted on a shaft in the lower end of the vertically movable link, a cam shaft adapted to be rotated by a connection with the driving gearing for oscillating the carriage, a continuously rotating cam member mounted on and splined to the cam shaft having a grooved collar and a vertically extending main cam for engaging the cam roller during the pipe cutting operation, a laterally extending secondary cam extending from the cam member, a shaft mounted beneath the cam shaft and extending at right angles thereto, a forked lever secured to said shaft having trunnion projections extending into the groove in the collar of the cam member for moving the main cam into or out of engagement with the cam roller, a bell crank lever secured to said shaft having one arm formed with a pawl, a latch for engaging the pawl for holding the main cam out of engagement with the cam roller with the trough in its lower position with the pipe normally out of engagement with the saw during the oscillations of the carriage, resilient means for holding the pawl in its latched position, a solenoid adapted to be energized to release the latch from the pawl, resilient means connected to the other arm of the bell crank lever for moving the main cam into engagement with the cam roller to raise the trough and project the pipe into cutting engagement with the saw, resilient means for returning the latch to the latched position with the main cam out of engagement with the cam roller, a housing surrounding the cam actuating mechanism, stops formed on the housing, a cam roller for engaging the secondary cam for sliding the main cam out of engagement with the cam roller in the lower end of the vertically movable link, a shaft for supporting the central portion of a bell crank lever journaled in the housing, said bell crank lever having a pair of horizontally extending arms with their ends pivoted to the ends of the shaft for the cam roller at the lower end of the vertically movable link, said bell crank lever having a vertical downwardly extending arm with a clevis bolt secured to its lower end with its shank extending laterally through the side wall of the housing, a nut on the outer end of the clevis bolt, and a spring on the clevis bolt interposed between the nut and the side wall of the housing for holding the ends of the bell crank lever against the stops formed on the housing.

7. A machine for severing continuously moving pipe or the like into predetermined lengths, comprising a stationary frame, a carriage having a pivoted link connection at each end with the stationary frame, a shaft mounted in the carriage, a saw mounted on the shaft, a cone drive for the shaft, a motor resiliently mounted on the stationary frame having a belt connection with the cone drive for continuously rotating the saw, a motor having a connection with driving gearing for continuously oscillating the carriage, a trough pivotally connected to the carriage and adapted to oscillate therewith for supporting the pipe adjacent to the saw, means for normally holding the pipe out of cutting engagement with the saw during an oscillation of the carriage, and cam actuated means for raising the trough to project the pipe vertically into cutting engagement with the saw during an oscillation of the carriage.

8. A machine for severing continuously moving pipe or the like into lengths, comprising a stationary frame, an oscillating carriage suspended by links for swinging movement from the stationary frame, a saw mounted on the carriage, a motor mounted on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, driving means for continuously oscillating the carriage, a trough pivotally connected to the carriage and adapted to oscillate therewith for supportng the pipe adjacent to the saw, means for normally holding the pipe out of cutting engagement with the saw during an oscillation of the carriage, a vertically movable link mounted below and adjacent to the carriage having its upper end pivoted to the movable trough, a cam roller mounted on a shaft in the lower end of the vertically movable link, a cam shaft mounted adjacent to the cam roller adapted to be continuously rotated by a connection with the driving means for continuously oscillating the carriage, a continuously rotating cam mounted on and splined to the cam shaft, means for automatically moving the continuously rotating cam on the cam shaft into engagement with the cam roller to raise the trough and project the pipe into cutting engagement with the saw during an oscillation of the carriage, and means for automatically returning the cam to its normal position out of engagement with the cam roller after the cutting operation.

9. A machine for severing continuously moving pipe or the like into predetermined lengths, comprising a stationary frame, a carriage having a pivoted link connection at each end with the stationary frame, a rotating saw mounted on the carriage, a motor mounted on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, driving means for continuously oscillating the carriage, means for adjusting the oscillating stroke of the carriage, a trough pivotally connected to the carriage and adapted to oscillate therewith for supporting the pipe adjacent to the saw, a vertically movable link mounted below and adjacent to the carriage having its upper end pivoted to the movable trough, a cam roller mounted on a shaft in the lower end of the vertically movable link, a housing surrounding the lower end of the vertically movable link, a cam shaft journ-aled in bearings in the housing adapted to be continuously rotated by a connection with the driving means for continuously oscillating the carriage, a continuously rotating cam member mounted on and splined to the cam shaft, said cam member having a vertically extending main cam and a secondary cam extending laterally therefrom, means for normally holding the main cam out of engagement with the cam roller in the lower end of the vertically movable link with the trough in its lowered position with the pipe out of cutting engagement with the saw during the oscillations of the carriage, means for moving the main cam into engagement with the cam roller to raise the trough and project the pipe into cutting engagement with the saw during an oscillation of the carriage, and a cam roller for engaging the secondary cam for sliding the main cam out of engagement with the cam roller in the lower end of the vertically movable link to lower the trough after the cutting operation.

10. A machine for severing continuously moving pipe or the like into predetermined lengths, comprising a stationary frame, a carriage having a pivoted link connection at each end with the stationary frame, driving means for oscillating the carriage, a saw mounted on the carriage, a motor mounted on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, a trough pivotally connected to the carriage and adapted to oscillate therewith for supporting the pipe adjacent to the saw, a vertically movable link mounted below and adjacent to the carriage having its upper end pivoted to the movable trough, a cam roller mounted on a shaft in the lower end of the vertically movable link, a housing surrounding the lower end of the vertically movable link, a cam shaft journaled in bearings in the housing adapted to be continuously rotated by a connection with the driving means for oscillating the carriage, a continuously rotating cam member mounted on and splined to the cam shaft having a grooved collar and a vertically extending main cam and a laterally extending secondary cam, a shaft mounted beneath the cam shaft and extending at right angles thereto, a forked lever secured to said shaft having trunnion projections extending into the groove in the collar of the cam member for moving the main cam into or out of engagement with the cam roller, a bell crank lever secured to said shaft having one arm formed with a pawl, a latch for engaging the pawl for holding the main cam out of engagement with the cam roller in the lower end of the vertically movable link with the trough in its lower position with the pipe normally out of engagement with the saw during the oscillations of the carriage, resilient means for holding the pawl in its latched position, a solenoid adapted to be energized to release the latch from the pawl, resilient means connected to the arm of the bell crank lever for moving the main cam into en'- gagement with the cam roller in the lower end of the vertically movable link to raise the trough and project the pipe into cutting engagement with the saw, and a cam roller for engaging the secondary cam for sliding the main cam .out of engagement with the cam roller in the lower end of the vertically movable link after each cutting operation.

11. A machine for severing continuously moving pipe or the like into predetermined lengths, comprisinga stationary frame, a carriage having a pivoted link connection at each end with the stationary frame, driving means for oscillating the carriage, a saw mounted on the carriage, a motor mounted on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, a movable trough pivotally connected to the carriage and oscillating therewith for supporting the pipe adjacent to the saw in the normal pass line out of cutting engagement with the saw during the oscillation of the carriage, a vertically movable link mounted adjacent to the carriage having its upper end pivoted to the movable trough, a cam roller mounted on a shaft in the lower end of the vertically movable link, a housing surrounding the lower end of the vertically movable link, a cam shaft journaled in bearings in the housing adapted to be continuously rotated by a connection with the motor for oscillating the carriage, a continuously rotating cam mounted on and splined to the cam shaft, a solenoid adapted to be energized for actuating means for moving the cam into engagement with the cam roller to raise the trough and project the pipe into cutting engagement with the saw, and means for sliding the cam out of engagement with the cam roller after each cutting operation.

12. A machine for severing continuously moving pipe or the like into lengths successively, comprising a stationary frame, a carriage having a link pivoted at its lower end to the carriage and its upper end to the stationary frame for supporting one end of the carriage, a rocking lever having its lower end pivoted to the carriage and its upper end to the stationary frame for supporting the other end of the carriage, a motor mounted adjacent thereto for oscillating the carriage, gearing driven by the motor, a screw threaded rod journaled in the rocking lever, an adjusting block screw threaded to engage the threaded rod, a pitman rod connecting the driven gearing directly with the adjusting block, means for rotating the threaded rod to raise or lower the adjusting block to Vary the oscillating stroke of the carriage, a saw mounted on the carriage, a motor supported on the stationary frame for continuously rotating the saw, a driving connection between the motor and the saw, a trough pivotally connected to the carriage and adapted to oscillate therewith for sup- 

